Match Funded Liabilities (Detail) - Dec. 31, 2014 - USD ($) $ in Thousands | Total |
Debt Instrument [Line Items] | |
Ending Balance | $ 5,624,088 |
Minimum | |
Debt Instrument [Line Items] | |
Percentage of fee on the unused borrowing | 0.50% |
Maximum | |
Debt Instrument [Line Items] | |
Percentage of fee on the unused borrowing | 0.625% |
Variable Interest Entity | |
Debt Instrument [Line Items] | |
Unused borrowing capacity | $ 488,912 |
Ending Balance | $ 5,624,088 |
Variable Interest Entity | Series 2012 T2 Term Notes | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 199 – 494 bps |
Debt instrument, maturity date | Oct. 1, 2045 |
Debt instrument, amortization date | 2015-10 |
Ending Balance | $ 450,000 |
Variable Interest Entity | Series 2012 T2 Term Notes | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 1.99% |
Variable Interest Entity | Series 2012 T2 Term Notes | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 4.94% |
Variable Interest Entity | Series 2013 T1 Term Notes | Group 2 | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 150 – 323 bps |
Debt instrument, maturity date | Jan. 1, 2046 |
Debt instrument, amortization date | 2016-01 |
Ending Balance | $ 350,000 |
Variable Interest Entity | Series 2013 T1 Term Notes | Group 2 | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 1.50% |
Variable Interest Entity | Series 2013 T1 Term Notes | Group 2 | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 3.23% |
Variable Interest Entity | Series 2013 T1 Term Notes | Group 3 | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 229 – 446 bps |
Debt instrument, maturity date | Jan. 1, 2048 |
Debt instrument, amortization date | 2018-01 |
Ending Balance | $ 150,000 |
Variable Interest Entity | Series 2013 T1 Term Notes | Group 3 | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 2.29% |
Variable Interest Entity | Series 2013 T1 Term Notes | Group 3 | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 4.46% |
Variable Interest Entity | Series 2013 T2 Term Notes | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 115 – 239 bps |
Debt instrument, maturity date | May 1, 2044 |
Debt instrument, amortization date | 2015-05 |
Ending Balance | $ 375,000 |
Variable Interest Entity | Series 2013 T2 Term Notes | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 1.15% |
Variable Interest Entity | Series 2013 T2 Term Notes | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 2.39% |
Variable Interest Entity | Series 2013 T3 Term Notes | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 179 – 313 bps |
Debt instrument, maturity date | May 1, 2046 |
Debt instrument, amortization date | 2017-05 |
Ending Balance | $ 475,000 |
Variable Interest Entity | Series 2013 T3 Term Notes | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 1.79% |
Variable Interest Entity | Series 2013 T3 Term Notes | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 3.13% |
Variable Interest Entity | Series 2013 T5 Term Notes | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 198 – 331 bps |
Debt instrument, maturity date | Aug. 1, 2046 |
Debt instrument, amortization date | 2016-08 |
Ending Balance | $ 200,000 |
Variable Interest Entity | Series 2013 T5 Term Notes | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 1.98% |
Variable Interest Entity | Series 2013 T5 Term Notes | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 3.31% |
Variable Interest Entity | Series 2013 T7 Term Notes | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 198 – 302 bps |
Debt instrument, maturity date | Nov. 1, 2046 |
Debt instrument, amortization date | 2016-11 |
Ending Balance | $ 300,000 |
Variable Interest Entity | Series 2013 T7 Term Notes | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 1.98% |
Variable Interest Entity | Series 2013 T7 Term Notes | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 3.02% |
Variable Interest Entity | Series 2014 T1 Term Notes | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 124 – 229 bps |
Debt instrument, maturity date | Jan. 1, 2045 |
Debt instrument, amortization date | 2015-01 |
Ending Balance | $ 600,000 |
Variable Interest Entity | Series 2014 T1 Term Notes | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 1.24% |
Variable Interest Entity | Series 2014 T1 Term Notes | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 2.29% |
Variable Interest Entity | Series 2014 T2 Term Notes | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 222 – 311 bps |
Debt instrument, maturity date | Jan. 1, 2047 |
Debt instrument, amortization date | 2017-01 |
Ending Balance | $ 200,000 |
Variable Interest Entity | Series 2014 T2 Term Notes | Minimum | |
Debt Instrument [Line Items] | |
Interest rate | 2.22% |
Variable Interest Entity | Series 2014 T2 Term Notes | Maximum | |
Debt Instrument [Line Items] | |
Interest rate | 3.11% |
Variable Interest Entity | Series 2014 T3 Term Notes | |
Debt Instrument [Line Items] | |
Interest rate | 2.81% |
Interest rate to calculate the cost of servicing advances | 281 bps |
Debt instrument, maturity date | Jun. 1, 2048 |
Debt instrument, amortization date | 2018-06 |
Ending Balance | $ 363,000 |
Variable Interest Entity | Series 2012 VF 1 Notes | LIBOR | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 1-Month LIBOR + 110 – 340 bps |
Debt instrument, maturity date | Aug. 1, 2045 |
Debt instrument, amortization date | 2015-08 |
Unused borrowing capacity | $ 143,673 |
Ending Balance | $ 556,327 |
Variable Interest Entity | Series 2012 VF 1 Notes | LIBOR | Minimum | |
Debt Instrument [Line Items] | |
Percentage added for interest rate | 1.10% |
Variable Interest Entity | Series 2012 VF 1 Notes | LIBOR | Maximum | |
Debt Instrument [Line Items] | |
Percentage added for interest rate | 3.40% |
Variable Interest Entity | Series 2012 VF 2 Notes | LIBOR | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 1-Month LIBOR + 110 – 340 bps |
Debt instrument, maturity date | Aug. 1, 2045 |
Debt instrument, amortization date | 2015-08 |
Unused borrowing capacity | $ 143,673 |
Ending Balance | $ 556,327 |
Variable Interest Entity | Series 2012 VF 2 Notes | LIBOR | Minimum | |
Debt Instrument [Line Items] | |
Percentage added for interest rate | 1.10% |
Variable Interest Entity | Series 2012 VF 2 Notes | LIBOR | Maximum | |
Debt Instrument [Line Items] | |
Percentage added for interest rate | 3.40% |
Variable Interest Entity | Series 2013 VF 3 Notes | LIBOR | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 1-Month LIBOR + 110 – 340 bps |
Debt instrument, maturity date | Aug. 1, 2045 |
Debt instrument, amortization date | 2015-08 |
Unused borrowing capacity | $ 143,673 |
Ending Balance | $ 556,327 |
Variable Interest Entity | Series 2013 VF 3 Notes | LIBOR | Minimum | |
Debt Instrument [Line Items] | |
Percentage added for interest rate | 1.10% |
Variable Interest Entity | Series 2013 VF 3 Notes | LIBOR | Maximum | |
Debt Instrument [Line Items] | |
Percentage added for interest rate | 3.40% |
Variable Interest Entity | Series 2013 VF 1 Notes | LIBOR | |
Debt Instrument [Line Items] | |
Interest rate to calculate the cost of servicing advances | 1-Month LIBOR + 150 - 245 bps |
Debt instrument, maturity date | Feb. 1, 2045 |
Debt instrument, amortization date | 2015-12 |
Unused borrowing capacity | $ 57,893 |
Ending Balance | $ 492,107 |
Variable Interest Entity | Series 2013 VF 1 Notes | LIBOR | Minimum | |
Debt Instrument [Line Items] | |
Percentage added for interest rate | 1.50% |
Variable Interest Entity | Series 2013 VF 1 Notes | LIBOR | Maximum | |
Debt Instrument [Line Items] | |
Percentage added for interest rate | 2.45% |